Fire-door apparatus.



F. w.'r\/|ART|N.l Fm nooH APPARATUS.'

- APPLICATION FILED SEPT. 6, 1913. o 1,171,451. Patented Feb.15,f1916.

WITNESSES .miren srnfrns PATENT oir-rior..

FREDERICKAW. MARTIN, OF NEW YORK, N. Y., ASSIGNOR TO ALBERT G. ELVIN, 0F SOMERVILLE, NEW JERSEY.

` FIRE-DOOR APPARATUS.

Specification of Letters Patent. Patented Feb.,y '1916.

Application filed September 6, 1913. Serial No. 788,387.

To all whom it may concern.

Be it known that I, FREDERICK IV. MARTIN, a. citizen of the UnitedA States, residing at the borough of Manhattan, in the city; county, and State of New York, have invented a certain new and useful Improvement in Fire-Door Apparatus, of which improvement the following is a specification.

This invention relates to Huid pressure operated apparatus forfire doors of locomotive boilers, or other furnaces, and has for its obj ect tovprovide animproved apparatus of this character, in which the furnace doors are pivoted to swing laterallyT upward in the opening movement, and to close by gravity.

The improvement claimed is hereinafter fully set forth. y I

In the accompanying drawings Figure 1 is a afront elevation of a lire door apparatus, embodying my improvement; Fig. 2, a vertical section of the motor cylinder and piston, and showing a portion of the doors with the connections to-the piston; and, Fig. 3, a detail section taken on the line 3-3 of Fig. 2. Y

According to the construction shown in the drawings my improvement is exemplified as applied to a locomotive boiler having a door frame, 1, suitably mounted upon the rear sheet of the fire bo'X and surrounding thel fire door opening. `The cylinder, 4, of the door motor is mounted on the frame in a vertical position directly above the middle of the tire door opening, as indicated in Figs.

1 and 2. The opening is normally covered.

by a pair of doors, 10 and 11, which meet together substantiallyon the vertical center line of the opening, and are provided with arms, 10a and 11a, iivotally mounted on pins, 7 and 8, which are journaled in the frame, and on which the doors are adapted to swing laterally and vertically in the opening movenient. As thus far described, the structure does not differ. materially from that shown and described in the prior application of Albert Gr. Elvin, Serial No. 781,943, filed July so, 191e.

According to `my present improvement,

the pivoted arms, or portions of the doors,

10a and 11a, are provided with the respective lugs, 12 and 13, which in the normal closed position of the doors, are inclined at an angle upward toward the motor cylinder, 4, to the piston, 6, of which they are coupled by means of the respective toggle links, 14 55 and 15, the lower end of the piston being slotted at Ga, and provided with a pin for this connection, as shown lin Figs. 2 and 3. The lower slotted end of the piston, 6, eX- tends through the lower open ,end of the cylinder, 4, while the upper end is closed by a cap, 5.

-The piston may be operated by fluid pres- I links fall within the straight lines from the centers of the respective pins, 7 and 8, to the pivot pin on vthe piston whenl the door reaches its predetermined full open position, thus limiting the travel of the piston. IVhen the fluid pressure is released, the doors re.

lturn to closed position by gravity. By so 'locating the toggle link connection, as above described, that each link will be in line with the pivot of the corresponding door arm in.

the full open position of the doors, it will be seen that the toggle connection serves as a cushion and stop for limiting the movement of the piston at that point.

It will now be seen that I have provided a.A

simple, compact, and durable formof connections between the motor piston and the doors, which -will operate positively, and limit the outward movement of the piston to the predetermined full open position of the doors.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a lire door apparatus, the combination of a pair of doors, each having a pivoted arm, a'luid pressure cylinder, a piston therein, and a'pair of toggle links connecting the piston to said arms and so located as to be in line withthe pivots of the respective roo arms in the predetermined full open position of the doors.

2. Ina lire door apparatus, the combinacally, a fluid pressure cylinder, a piston therein, and a pair of toggle'links pivotally connected to the piston and to said arms, said links being so located as to fall Within @the straight lines from the door pivots to piston connection when the door` reaches the predetermined full open position.

In testimony whereof I have hereunto set my hand.

FREDERICK W. MARTIN.

Witnesses:

EMiLY L. MYERS, EUGENE L. MARTIN. 

